Not infrequently enough? No idea what that means. I can tell you that I watch a lot of football and it is extremely rare. There were around 350 interceptions in the NFL this season, and I can only think of one that I remember resulting in a fumble lost by the intercepting team. At most 3 to 5. There are many "concerns" during a game. Being aware of something as a possibility is one thing, but laying down out of fear of a 1% freak thing happening is ridiculous. There is no good reason I have heard for Burnett laying down like that.